Thanks for all the good suggestions and feedback!

The consensus seems to be he's a beast and worth it, if you can get him into
CC..
The cultist idea is very cool. However since I wanted t field a Black Legion themed army, I feel they are way too puny and unsignificant for Abaddon to mess around with. The best for the best!
The obliterator idea is cool too. But I can't squeeze in a Land raider at this points level. Adding one would be a very easy way of reaching 1500 though.
I did an updated version of the orginal list, based on the
MoS + Icon idea, to give Abaddon and his unit Feel no pain. It's just to evil not to try.
To get the points I acutally ended up removing the terminator heavy weapon altogher, instead of swapping the reaper for a heavy flamer. That feels pretty good though, as a template weapon seems a waste of BS5 (in the case of the bringers of despair which I wanted to field), but mostly because I want them in
CC and a
HF might actually kill enough closest models so I fail the charge.. Definitely more survivable this way, but not convinced
FnP is worth more than an extra attack for the whole unit in the first turn. But then again getting there is going to be hard as any opponent is likely to focus everything on them, and rightly so..
Abaddon and the Harbringers of despair v2- Black Legion 1250
Abaddon
265
5 terminators
the Bringers of despair (WS5, BS5)
3 combi meltas
chainfist
mark of slaanesh
icon of excess
VoTLW
289
10
CSM,
ccw+
bp
2 meltaguns, 1 combi-melta
mark of khorne
VoTLW
200
10
CSM, boltguns (sonic blaster count as)
2 plasma guns (blastmaster count as)
VoTLW
180
2 obliterators, mark of nurgle,
VoTLW
158
2 obliterators, mark of nurgle,
VoTLW
158
1250